I like what I see here. I kept my expectations low, so they were exceeded. To what degree they've exceeded my expectations, though, I can't say until we see everything the update offers when it's released.
The additional eye and skin colors are nice to see and I'm already coming up with ideas for "costumes" inasmuch as is possible in these games.
Torn on the prospect of growing pumpkins for DIYs. On one hand, I love it, but on the other, I don't really know where to put the pumpkin patch on my island. I have areas that I set aside for new buildings if they're added, but never really factored in something like this despite the rumors of farming that had been floating around. Guess I'll have to rethink some things in the next few days regarding my island's layout.
I'm hoping we can still get those pumpkin-head masks like we got in New Leaf, whether as a result of a trick like before, or through crafting like the Bunny Day clothes that we could craft with the various eggs. My main New Leaf town was horror themed and the mayor would often, though not always, wear the various pumpkin head masks. My New Horizons island isn't horror or Halloween themed, but I dunno, I'd still like to have those in this game anyway. Speaking of trick items returning, I'd like to see the patched clothes return as well, though they seem unlikely.
I wish those new Reactions were in New Leaf because of my aforementioned horror town in that game. One of the characters is a vampire and it would've fit perfectly. Alas. Nice addition, and no doubt appreciated by those who have darker-themed islands in New Horizons.
Not sure what to think about how the trick-or-treating works now. It looks less interesting than in the previous games, but we barely saw anything of it, so I'll withhold judgment.
Regardless of how it all shakes out by the end, I look forward to experiencing everything this update has to offer. Hopefully everything added in this update will suffice in helping us all have a very happy Halloween.